|
<SfTreeView TValue="MailItem" AllowDragAndDrop="true" @ref="tree">
<TreeViewEvents TValue="MailItem" OnNodeDragged="nodeDrag"></TreeViewEvents>
<TreeViewFieldsSettings TValue="MailItem" Id="Id" DataSource="@MyFolder" Text="FolderName" HtmlAttributes="htmlAttribute" ParentID="ParentId" HasChildren="HasSubFolders" Expanded="Expanded"></TreeViewFieldsSettings>
</SfTreeView>
public class MailItem
{
public string Id { get; set; }
public string ParentId { get; set; }
public string FolderName { get; set; }
public bool Expanded { get; set; }
public bool HasSubFolders { get; set; }
public Dictionary<string, Object> htmlAttribute { get; set; }
public string value { get; set; }
}
MyFolder.Add(new MailItem
{
Id = "1",
FolderName = "Inbox",
HasSubFolders = true,
htmlAttribute = new Dictionary<string, Object>() {{ "class" , "tree_1"} },
value ="1"
});
public async Task nodeDrag(DragAndDropEventArgs args)
{
// Get the Dragged node details declared in the datasource.
var draggedNode = await this.tree.GetTreeData(args.DraggedNodeData.Id);
string[] classlist = await args.DroppedNode.GetClassList();
foreach (string x in classlist)
{
// Check the dropped tree contains the class. Check if it is another tree or not.
if( x == "tree_2")
{
// It prevents the node removal from Dragged tree.
args.Cancel = true;
// add the draggged node in another tree by using addNodes method.
await this.tree1.AddNodes(draggedNode, args.DroppedNodeData.Id);
}
}
} | 
